I have a 2.1.0 trio of Tincs. I was taking pics of some tads at about 2:15 AM. I became aware a short buzzing sound that was repeating. I thought is was my water bottle mister, but soon found it was coming from the Tinc Viv! He has been at it for about 15 mins. now! Do Tincs normally call at night? Do many people hear them? I was under the impression that Tincs were all but inaudible! I guess my male has a set of pipes, 'cause he was singing loud and clear!